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Approaches to deriving Schwann cells from human bone marrow for neural tube regeneration in a clinical setting

Hidayah HN, Mazzre M, Ng AM, Ruszymah BH, Shalimar A

Med J Malaysia, 2008 Jul;63 Suppl A:39-40.
PMID: 19024973

Bone marrow derived Mesenchymal stem cells (MSCs) were evaluated as an alternative source for tissue engineering of peripheral nerves. Human MSCs were subjected to a series of treatment with a reducing agent, retinoic acid and a combination of trophic factors. This treated MSCs differentiated into Schwann cells were characterized in vitro via flow cytometry analysis and immunocytochemically. In contrast to untreated MSCs, differentiated MSCs expressed Schwann cell markers in vitro, as we confirmed by flow cytometry analysis and immunocytochemically. These results suggest that human MSCs can be induced to be a substitute for Schwann cells that may be applied for nerve regeneration since it is difficult to grow Schwann cells in vitro.
Fulltext Malaysian Cardiothoracic Surgery Registry--a patient registry to evaluate the health outcomes of patients undergoing surgery for cardiothoracic diseases in Malaysia

Anas R, Rahman I, Jahizah H, Hassan A, Ezani T, Jong YH, et al.

Med J Malaysia, 2008 Sep;63 Suppl C:78-80.
PMID: 19227680

The formulation of the Cardiothoracic Registry. Cardiothoracic surgery is the field of medicine involved in surgical treatment of diseases affecting organs inside the thorax (the chest). It is a general treatment of conditions of the heart (heart disease) and lungs (lung disease). In Malaysia, due to lack of data collection we do not have estimates of number and outcome of such procedure in the country. Western figures are often used as our reference values and this may not accurately reflect our Malaysian population. The Malaysian Cardiothoracic Surgery Registry (MyCARE) by the Ministry of Health will be a valuable tool to provide timely and robust data of cardiology practice, its safety and cost effectiveness and most importantly the outcome of these patients in the Malaysian setting.
Fulltext Sciatic nerve repair with tissue engineered nerve: Olfactory ensheathing cells seeded poly(lactic-co-glygolic acid) conduit in an animal model

Tan CW, Ng MH, Ohnmar H, Lokanathan Y, Nur-Hidayah H, Roohi SA, et al.

Indian J Orthop, 2013 Nov;47(6):547-52.
PMID: 24379458 DOI: 10.4103/0019-5413.121572

BACKGROUND AND AIM: Synthetic nerve conduits have been sought for repair of nerve defects as the autologous nerve grafts causes donor site morbidity and possess other drawbacks. Many strategies have been investigated to improve nerve regeneration through synthetic nerve guided conduits. Olfactory ensheathing cells (OECs) that share both Schwann cell and astrocytic characteristics have been shown to promote axonal regeneration after transplantation. The present study was driven by the hypothesis that tissue-engineered poly(lactic-co-glycolic acid) (PLGA) seeded with OECs would improve peripheral nerve regeneration in a long sciatic nerve defect.
MATERIALS AND METHODS: Sciatic nerve gap of 15 mm was created in six adult female Sprague-Dawley rats and implanted with PLGA seeded with OECs. The nerve regeneration was assessed electrophysiologically at 2, 4 and 6 weeks following implantation. Histopathological examination, scanning electron microscopic (SEM) examination and immunohistochemical analysis were performed at the end of the study.
RESULTS: Nerve conduction studies revealed a significant improvement of nerve conduction velocities whereby the mean nerve conduction velocity increases from 4.2 ΁ 0.4 m/s at week 2 to 27.3 ΁ 5.7 m/s at week 6 post-implantation (P < 0.0001). Histological analysis revealed presence of spindle-shaped cells. Immunohistochemical analysis further demonstrated the expression of S100 protein in both cell nucleus and the cytoplasm in these cells, hence confirming their Schwann-cell-like property. Under SEM, these cells were found to be actively secreting extracellular matrix.
CONCLUSION: Tissue-engineered PLGA conduit seeded with OECs provided a permissive environment to facilitate nerve regeneration in a small animal model.

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